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首页> 外文会议>Role of Concrete in Nuclear Facilities >CONCRETE BEHAVIOUR IN ENGINEERING BARRIERS FOR LOW AND MEDIUM RADIOACTIVE WASTE REPOSITORY: EXAMPLE OF El CABRIL, CORDOBA, SPAIN
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CONCRETE BEHAVIOUR IN ENGINEERING BARRIERS FOR LOW AND MEDIUM RADIOACTIVE WASTE REPOSITORY: EXAMPLE OF El CABRIL, CORDOBA, SPAIN

机译：中低放射性废物处置工程屏障中的混凝土行为：El Cabril，Cordoba，西班牙的示例

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Prestressed and reinforced concrete are the most usual material used as engineering barriers in nuclear disposal facilities. The record of modern concrete is however no longer than about 100 years. During this time, it has been noticed that the material gives a good performance in many environments, however several chemical aggressive species in water, soil or the atmosphere may react with the cement mineralogical phases and perturbate its integrity. The challenge of concrete as an engineering barrier is therefore its long term stability. Concrete to be used in engineering barriers has to be properly designed. The cements have to be traditional and able enable low transport rate. They have to be of low C_3A and alkali contents. The concrete proportioning has to be so, to result in low porosity. The El Cabril repository has a design life of 300-500 years and therefore, these structures should remain until this target service life. The possible aggressive conditions that the cement based materials can suffer have been identified to be: carbonation, water permeation (leaching) and reinforcement corrosion. More unlikely may be the biological attack. Chlorides are not in the environment but they are inside the drums as part of analytical wastes. The main cement based materials used as engineer barrier in the repository of El Cabril for low and medium radioactive wastes are the Cells, the Containers and the mortar filling the gaps between the drums introduced in the containers. Cells and containers are made of the same concrete composition while the mortar was specifically designed to be pumpable and with high impermeability. In this paper results of concrete chararcteristics are given as well as the monitoring of the behaviour of reinforcement corrosion parameters from 1995. This monitoring has been made in a buried structure with embedded sensors. The effect of temperature is commented.
机译：预应力和钢筋混凝土是核处置设施中用作工程屏障的最常用材料。但是，现代混凝土的记录不超过大约100年。在这段时间内，人们已经注意到该材料在许多环境中均具有良好的性能，但是在水，土壤或大气中的几种化学侵蚀性物种可能会与水泥矿物相发生反应，并扰乱其完整性。因此，混凝土作为工程屏障的挑战在于其长期稳定性。用于工程屏障的混凝土必须经过适当设计。水泥必须是传统的并且能够实现低运输速率。它们必须具有低的C_3A和碱含量。混凝土配比必须如此，以导致低孔隙率。 El Cabril储存库的设计寿命为300-500年，因此，应保留这些结构，直到达到目标使用寿命为止。水泥基材料可能遭受的侵蚀性条件已确定为：碳化，水渗透（浸出）和增强腐蚀。发生生物攻击的可能性较小。氯化物不在环境中，但作为分析废物的一部分，它们位于桶中。 El Cabril储存库中用于中低放射性废物的用作工程师屏障的主要水泥基材料是电池，容器和填充在容器中引入的料桶之间间隙的灰浆。隔室和容器由相同的混凝土组成制成，而砂浆专门设计成可泵送且具有高抗渗性。本文给出了混凝土特性的结果以及1995年以来对钢筋腐蚀参数行为的监控。这种监控是在带有嵌入式传感器的地下结构中进行的。评论了温度的影响。

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